飞机的平均速度是火车的八倍.飞机用少于火车8 3/4 小时的时间跑完1050km.请找出火车和飞机的平均速度.
题目原题是英文，我翻译的不怎么顺口。想一想。下面是原题。
The average speed of a plane is eight times great as the average speed of a train.The plane takes 8 3/4 hours less than the train to travel 1050 km.Find the average speed of the plane and the average speed of the train.